High-Resolution Gravity Measurements on Board an Autonomous Underwater Vehicle: Data Reduction and Accuracy Assessment - Cnam - Conservatoire national des arts et métiers Accéder directement au contenu
Article Dans Une Revue Remote Sensing Année : 2024

High-Resolution Gravity Measurements on Board an Autonomous Underwater Vehicle: Data Reduction and Accuracy Assessment

Dinh Toan Vu
José Cali
Marcia Maia
  • Fonction : Auteur
  • PersonId : 736867
  • IdHAL : marcia-maia
Charles Poitou
  • Fonction : Auteur
  • PersonId : 1174665
Jérôme Ammann
  • Fonction : Auteur
  • PersonId : 889369
Clément Roussel
  • Fonction : Auteur
  • PersonId : 1352268
Jean-François D’eu
Marie-Édith Bouhier
  • Fonction : Auteur
  • PersonId : 1052911

Résumé

Gravity on Earth is of great interest in geodesy, geophysics, and natural resource exploration. Ship-based gravimeters are a widely used instrument for the collection of surface gravity field data in marine regions. However, due to the considerable distance from the sea surface to the seafloor, the spatial resolution of surface gravity data collected from ships is often insufficient to image the detail of seafloor geological structures and to explore offshore natural minerals. Therefore, the development of a mobile underwater gravimetry system is necessary. The GraviMob gravimeter, developed for a moving underwater platform by Geo-Ocean (UMR 6538 CNRS-Ifremer-UBO-UBS), GeF (UR4630, Cnam) and MAPPEM Geophysics, has been tested over the last few years. In this study, we report on the high-resolution gravity measurements from the GraviMob system mounted on an Autonomous Underwater Vehicle, which can measure at depths of up to several kilometres. The dedicated GraviMob underwater gravity measurements were conducted in the Mediterranean Sea in March 2016, with a total of 26 underwater measurement profiles. All these measurement profiles were processed and validated. In a first step, the GraviMob gravity measurements were corrected for temperature based on a linear relationship between temperature and gravity differences. Through repeated profiles, we acquired GraviMob gravity measurements with an estimated error varying from 0.8 to 2.6 mGal with standard deviation after applying the proposed temperature correction. In a second step, the shipborne gravity data were downward continued to the measurement depth to validate the GraviMob measurements. Comparisons between the corrected GraviMob gravity anomalies and downward continued surface shipborne gravity data revealed a standard deviation varying from 0.8 to 3.2 mGal and a mean bias value varying from −0.6 to 0.6 mGal. These results highlight the great potential of the GraviMob system in measuring underwater gravity.
Fichier principal
Vignette du fichier
remotesensing-16-00461.pdf (22.81 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04458127 , version 1 (16-02-2024)

Identifiants

Citer

Dinh Toan Vu, Jérôme Verdun, José Cali, Marcia Maia, Charles Poitou, et al.. High-Resolution Gravity Measurements on Board an Autonomous Underwater Vehicle: Data Reduction and Accuracy Assessment. Remote Sensing, 2024, 16 (3), pp.461. ⟨10.3390/rs16030461⟩. ⟨hal-04458127⟩
26 Consultations
7 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More